Electrode for electric furnaces



Aug. 6, 1929. SEM 1,723,582

ELECTRODE FOR ELECTRI C FURNACES Filed April *7, 7

INVENTOR.

M 6 BY ATTORNEY.

Patented A115 6, 1929 UNITED STATES PATENT OFFICE.

MATEIAS OVBOM SEE, OF OSLO, NORWAY, LSSIGNOR T DET NORSEE AKTIESELSKAB FOB ELEKTBOKEMISK INDUSTRI OF NORWAY, 0F OSLO, NORWAY.

ELECTRODE FOR ELECTRIC FURNACES.

, Application filed April 7, 1927, Serial No. 181,821, and in Norway April 7, 1926.

. The present invention relates to the soelectric furnace. These electrodes consist ,l of a lower part where the electrode mass is baked and is a good conductor and an upper part where the mass is raw and non-conductive. To securea good transmission of current from the current supplying devices to the baked part of the electrode special precautions must be taken and several modes of application thereof have previously been described, for instance in U. S. Patent No. 1,441,037 and No. 1,440,724, where various conductive ribs and inserts have been shown. Such inserts may consist of metal or of ready baked pieces of carbon or graphite. These inserts may be embedded in the electrode mass in difierent ways, but I have found that in many cases it is advantageous to arrange them at the periphery of the electrode in such manner that they are directly in touch with the current-carrying contacts or the part of the electrode casing inside said contacts, if an electrode casing is employed.

.1 have now found that in such cases and especially with big-electrodes it is difiicult to et a good attachment of the peripheral carfion inserts. These will easily fall off the electrode at its lower part as no satisfactory binding of the'carbon inserts to the adjacent electrode mass isv obtained. The" carbon inserts must therefore be suspended one in the other which is complicated and unsafe.

The principal object of the present invention is to provide a good attachment between the inserts and the electrode -mass by giving the carbon inserts such a shape that the electrode mass may penetrate into or surround the single parts of the carbon inserts. When the mass'has been baked the carbon inserts will then be completely fixedthereto.

4 Another object of the invention is to provide a self-bakin electrode in which the mantle or shell is ormed of sections of prebaked electrode material, the core of the electrode, as usual being, formed of raw electrode mass. In such an electrode the contacts make contact directly against the pre-baked sections forming the shell.

' In the drawing forming part of this application an example of my invention is illustrated, but it is to be understood that my invention is not limited thereto.

In such drawing Figure 1 shows a longitudinal section of a continuous electrode constructed in accordance with this invention. F'gure 2 shows a horizontal section of the electrode illustrated in Fig. 1.

Referring more particularly to the drawing electrodemass is indicated at 1 and the pre-baked sections forming the shell or casing of the electrode are indicated at 2, such sections or inserts having cavities 3, which may be of different shapes as indicated in the upper and lower sections or inserts rewhile in use in the electric furnace comprising raw electrode mass and acasing, the casing being formed. of pre-baked carbon inserts arranged at the periphery of the electrode in abutting relation.

' 2. An electrode of the kind that is baked while in use in the electric furnace comprising raw electrode mass and a casing, the casing being formed of pre-baked carbon inserts arranged at the peripher of the electrode in abutting relation an having portions interlocked with the raw electrode mass, whereby when such mass is baked a reliable fixation of the carbon inserts and the mass will be obtained.

Signed at New York, N. Y. this 5th day of April, 1927. Y

MATHILS OVROM SEM. 

